Auxiliary gas tank



FIG. 1 is a top, front, and right side perspective of an auxiliary gas tank showing my new design;

FIG. 2 is an enlargement perspective view thereof, where the area of enlargement is indicated by the broken line bubble in FIG. 1;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a right side elevation view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The broken lines in the drawings illustrate portions of the auxiliary gas tank that form no part of the claimed design. 

CLAIM The ornamental design for an auxiliary gas tank, as shown and described. 